Apparent Retrograde Motion of Mars

Apparent Retrograde Motion of Mars

The planets orbiting the Sun farther than Earth’s orbit generally track slowly eastwards through the constellations as the months pass. For several weeks either side of the opposition, however, they appear to change direction and move westward, before later resuming their eastward track.

The period where they seem to move in reverse is called retrograde motion. It occurs because the faster-moving Earth overtakes a more distant planet, making it appear to move backward against the stars. You might see a similar effect on the motorway when a car is overtaking a slower-moving car—it appears to move backward against the more distant scenery,

During this apparition, Mars moves in a retrograde motion from December 21st to March 10th, from six weeks before opposition and six weeks after opposition, before commencing its eastwards track towards the star Regulus.

  • Client XplorePaks LLC.
  • Date August 19, 2019
  • Tags User Interface
  • URL View Project

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